\begin{table}

\caption{Registration and Voting by Treatment Arm (Among those not already registered) \label{maincoefftable_unreg}}
\centering
\begin{tabular}[t]{lcc}
\toprule
  & Voter Registration & November 2021 Turnout\\
\midrule
(Intercept) & \num{0.018}* & \num{0.003}*\\
 & (\num{0.002}) & (\num{0.001})\\
Information-Only Mail (T1) & \num{0.003} & \num{0.002}\\
 & (\num{0.003}) & \vphantom{1} (\num{0.001})\\
Research-Informed Mail (T2) & \num{0.007}* & \num{0.004}*\\
 & (\num{0.003}) & (\num{0.001})\\
\midrule
Num.Obs. & \num{15760} & \num{15760}\\
\bottomrule
\multicolumn{3}{l}{\rule{0pt}{1em}* p $<$ 0.05}\\
\end{tabular}
\end{table}
